show isis adjacency

Interface

Interface through which the neighbor is reachable.

System

System identifier (sysid), displayed as a name, if possible.

L or Level

Level:

• 1—Level 1 only

• 2—Level 2 only

• 3—Level 1 and Level 2

An exclamation point (!) preceding the level number indicates that the adjacency is missing an IP address.

State

State of the adjacency: Up, Down, New, One-way, Initializing, or Rejected.

Hold (secs)

Remaining hold time of the adjacency.

SNPA

Subnetwork point of attachment (MAC address of the next hop).

Expires in

How long until the adjacency expires, in seconds.

Priority

Priority to become the designated intermediate system.

Up/Down transitions

Count of adjacency status changes from Up to Down or from Down to Up.

Last transition

Time of the last Up/Down transition.

Circuit type

Bit mask of levels on this interface: 1=Level 1 router; 2=Level 2 router; 3=both Level 1 and Level 2 router.

Speaks

Protocols supported by this neighbor.

MAC address

MAC address of the interface.

Topologies

Supported topologies.

Restart capable

Whether a neighbor is capable of graceful restart: Yes or No.

Adjacency advertisement: Advertise

This routing device has signaled to advertise this interface to its neighbors in their link-state PDUs.

Adjacency advertisement: Suppress

This neighbor has signaled not to advertise the interface in the routing device's outbound link-state PDUs.

IP addresses

IP address of this neighbor.

IPV6 Address

IPv6 address of the neighbor.

Level 1 IPv4 Adj-SID

Level 1 IPv4 node-SID of the adjacent neighbor.

Level 1 IPv6 Adj-SID

Level 1 IPv6 node-SID of the adjacent neighbor.

Level 2 IPv4 Adj-SID

Level 2 IPv4 node-SID of the adjacent neighbor.

Level 2 IPv6 Adj-SID

Level 2 IPv6 node-SID of the adjacent neighbor.

SRv6

Segment routing capability is enabled on the device.

End-X-SID

Function for SRv6 adjacency.

Flavor

End-X-SID function can have the following flavors:

• PSP— Penultimate segment pop of the segment routing header (SRH).

• USD— Ultimate segment pop of the SRH.

• USP— Ultimate segment decapsulation of the SRH.

Transition log

List of recent transitions, including:

• When—Time at which an IS-IS adjacency transition occurred.

• State—Current state of the IS-IS adjacency (up, down, or rejected).

  • Up—Adjacency is up and operational.

  • Down—Adjacency is down and not available.

  • Rejected—Adjacency has been rejected.

• Event—Type of transition that occurred.

  • Seenself—Possible routing loop has been detected.

  • Interface down—IS-IS interface has gone down and is no longer available.

  • Error—Adjacency error.

• Down reason—Reason that an IS-IS adjacency is down:

  • 3-Way Handshake Failed—Connection establishment failed.

  • Address Mismatch—Address mismatch caused link failure.

  • Aged Out—Link expired.

  • ISO Area Mismatch—IS-IS area mismatch caused link failure.

  • Bad Hello—Unacceptable hello message caused link failure.

  • BFD Session Down—Bidirectional failure detection caused link failure.

  • Interface Disabled—IS-IS interface is disabled.

  • Interface Down—IS-IS interface is unavailable.

  • Interface Level Disabled—IS-IS level is disabled.

  • Level Changed—IS-IS level has changed on the adjacency.

  • Level Mismatch—Levels on adjacency are not compatible.

  • MPLS LSP Down—Label-switched path (LSP) is unavailable.

  • MT Topology Changed—IS-IS topology has changed.

  • MT Topology Mismatch—IS-IS topology is mismatched.

  • Remote System ID Changed—Adjacency peer system ID changed.

  • Protocol Shutdown—IS-IS protocol is disabled.

  • CLI Command—Adjacency brought down by user.

  • Unknown—Unknown.